Answer in brief
CVE-2026-98591 records a Unknown severity vulnerability in bpf: Fix bounds check for skb-backed dynptrs. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6f5a630d7c57cd79b1f526a95e757311e32d41e5 <1b923538598be768e9f2f258a77a083d00e0c78b || >=6f5a630d7c57cd79b1f526a95e757311e32d41e5 <37877a24758068742fef687a7cf5362360dde1d1 || >=6f5a630d7c57cd79b1f526a95e757311e32d41e5 <1196903a27cac5c929c7517e987a8d159f20c5e5 || >=6f5a630d7c57cd79b1f526a95e757311e32d41e5 <39ffceaddb10753eac12785dba6ac0673860b4ac || >=6f5a630d7c57cd79b1f526a95e757311e32d41e5 <ed6eec97b534979dcf28b40c389cee57bd6561d4 | 1b923538598be768e9f2f258a77a083d00e0c78b, 37877a24758068742fef687a7cf5362360dde1d1, 1196903a27cac5c929c7517e987a8d159f20c5e5, 39ffceaddb10753eac12785dba6ac0673860b4ac, ed6eec97b534979dcf28b40c389cee57bd6561d4 |
| Linux/Linuxgeneric | 6.6 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bounds check for skb-backed dynptrs The skb_pointer_if_linear() function checks whether a memory region of length len starting at offset off into the skb is in the linear area, and returns a pointer to the region if so. The check currently subtracts between skb_headlen and offset of the check, and since skb_headlen is unsigned the subtraction can underflow. This causes the bounds check to spuriously pass and generate an arbitrary pointer of the form *(skb->data + off). The only user of this helper is currently skb-backed BPF dynptr code. Returning the wrong pointer leads to the dynptr erroneously being backed with invalid memory. Ensure the subtraction cannot underflow, and fail the check if it would. Use u64 arithmetic to also prevent overflow when calculating (skb_headlen(skb) - off) since off is unsigned.
Quoted source text, attributed separately from HOL analysis.